* {
    margin: 0;
    padding: 0;
    color : black;
}

.plat {
    top: 50%;
    left: 50%;
    margin-left: -175px;
    margin-top: -85px;
    position: absolute;
    /* border: 1px solid black; */
    height: 170px;
    width: 350px;
}

.circle1,
.circle2,
.circle3,
.circle4,
.circle5 {
    height: 100px;
    width: 100px;
    border: 5px solid black;
    border-radius: 50%;
}

.circle1 {
    position: absolute;
    border-color: red;
}

.circle2 {
    position: absolute;
    border-color: green;
    left: 120px;
    z-index: 2;
}

.circle3 {
    position: absolute;
    border-color: blue;
    left: 240px;
}

.circle4 {
    position: absolute;
    border-color: purple;
    left: 60px;
    top: 60px;
}

.circle5 {
    position: absolute;
    border-color: yellow;
    left: 180px;
    top : 60px; 
}

.nav {
    list-style: none;
}

.nav li {
    float: left;
    display: inline-block;
    height: 30px;
    line-height: 30px;
    margin: 0 10px;
}

.nav li a {
    text-decoration: none;
    color: #ff4400;
    display: inline-block;
    height: 30px;
    padding: 0 10px;
    border-radius: 15px; 
    font-weight: bold;
}

.nav li a:hover {
    background-color: #ff4400;
    color: white;
}

.nav::after {
    content: "";
    display: block;
    clear: both;
}

.nowrap_p {
    width: 100 px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}